SearchAlterationOptions in a Microsoft Graph Search Request not working

Question

I'm trying to add logic to my c# function app that does something similar to this test query I tried in Graph Explorer:

This is the response I get back (notice that it automatically fixed my typo and ran the search)

I'm trying to do this programmatically in c# but it doesn't correct my spelling. This is what my c# code looks like in part:

         var requestBody = new Microsoft.Graph.Search.Query.QueryPostRequestBody
            {
                Requests = new List<SearchRequest>
                    {
                        new SearchRequest
                        {
                            EntityTypes = new List<EntityType?>
                            {
                                EntityType.DriveItem,
                            },
                            Query = new SearchQuery
                            {
                                QueryString = this.searchQuery,
                            },
                            Fields = new List<string>
                            {
                                "listId",
                                "author",
                                "title",
                            },
                            QueryAlterationOptions = new SearchAlterationOptions
                            {
                                EnableSuggestion = true,
                                EnableModification = true,
                            },
                            Region ="US"
                        },
                    },
            };

            var result = await graphClient.Search.Query.PostAsync(requestBody);

This is a screenshot of what I get back when I send this query to my app via postman:

I get an error that looks like this:

EDIT 1

Trying "NAM" for the region gives me this error:

Answer 1

It seems to me that the value US of the region property is not correct. Possible values for the region property are:

Code	Geo location
APC	Macro Region Geography 2 - Asia-Pacific
AUS	Australia
BRA	Brazil
CAN	Canada
EUR	Macro Region Geography 1 - EMEA
FRA	France
DEU	Germany
IND	India
JPN	Japan
KOR	Korea
NAM	Macro Region Geography 3 - Americas
NOR	Norway
QAT	Qatar
POL	Poland
ZAF	South Africa
SWE	Sweden
CHE	Switzerland
ARE	United Arab Emirates
GBR	United Kingdom

Try to use one of the value above

var requestBody = new Microsoft.Graph.Search.Query.QueryPostRequestBody
        {
            Requests = new List<SearchRequest>
                {
                    new SearchRequest
                    {
                        EntityTypes = new List<EntityType?>
                        {
                            EntityType.DriveItem,
                        },
                        Query = new SearchQuery
                        {
                            QueryString = this.searchQuery,
                        },
                        Fields = new List<string>
                        {
                            "listId",
                            "author",
                            "title",
                        },
                        QueryAlterationOptions = new SearchAlterationOptions
                        {
                            EnableSuggestion = true,
                            EnableModification = true,
                        },
                        Region ="NAM"
                    },
                },
        };

        var result = await graphClient.Search.Query.PostAsync(requestBody);